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Free solar, battery and electronics calculators
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23 free calculators for home energy and electronics. Size a solar system from your bill, see how long a battery will run, estimate appliance running costs, plan EV charging, or pick a wire size with voltage drop. For makers and engineers: resistor colour codes, LED resistors, voltage dividers, RC filters, 555 timers, PCB trace width, plus FPGA clock, CRC and FIFO tools. Every result shows the formula and a worked example. No sign-up, and any calculator embeds in a blog.
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More like this: all 246 launches in online calculation tools →
PH · launched Oct 29, 2026 · 1 upvote (top 67%)
- Energy & climate
- Analytics & BI
- B2C
- Not AI
- Commercial product
- Hardware
- Education
- Climate Tech
Similar launches
See all 562 similar launches →Could you build this?
Yes Twenty-three calculators built on standard electrical and solar formulas are straightforward web tools. Accuracy checks are the main effort.
Competitors
Other products that read as similar to this one : 562 launches clear the similarity bar, closest 8 shown.
Attention rank: #166 of 563 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 359 days after the earliest competitor.
- Home Energy Calculators · ph · 2026-10-11 · 1 upvotes · similarity 0.73
- CalcGoose · ph · 2026-09-30 · 1 upvotes · similarity 0.63
- VoltFlow · ph · 2026-10-09 · 2 upvotes · similarity 0.61
- Electricity Cost Calculator · ph · 2026-10-15 · 1 upvotes · similarity 0.61
- Solar Energy Calculator · ph · 2026-10-15 · 1 upvotes · similarity 0.61
- DM Tool Studio · ph · 2026-10-02 · 2 upvotes · similarity 0.58
- Battery Life Calculator · ph · 2026-10-15 · 2 upvotes · similarity 0.57
- UnitsConvertors.com · ph · 2026-10-13 · 1 upvotes · similarity 0.56